The Posey tube and the Webster Street tube are two parallel underwater tunnels connecting the cities of Oakland and Alameda, California, running beneath the Oakland Estuary. Both are immersed tubes, constructed by sinking precast concrete segments to a trench in the Estuary floor, then sealing them together to create a tunnel. The Posey tube, opened in 1928, carries Oakland-bound traffic under the Estuary, while the Webster tube carries traffic bound for Alameda.
The Posey tube is the second-oldest underwater vehicular tunnel in the US, preceded only by the Holland Tunnel. The Art Deco Structure above the tunnels hold the ventilation fans to remove car exhaust and pump fresh air into the Tube.
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